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Catalytic-independent functions of INTAC confer sensitivity to BET inhibition

ABSTRACT: This SuperSeries is composed of the SubSeries listed below.

ORGANISM(S): Mus musculus

PROVIDER: GSE274476 | GEO | 2024/10/11

REPOSITORIES: GEO

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Catalytic-independent functions of INTAC confer sensitivity to BET inhibition [RNA-seq]

Project description:Chromatin and transcription regulators are critical to defining cell identity through shaping epigenetic and transcriptional landscapes, with their misregulation being closely linked to oncogenesis. Pharmacologically targeting these regulators, particularly the transcription activating BET proteins, has emerged as a promising approach in cancer therapy, yet intrinsic or acquired resistance frequently occurs with poorly understood mechanisms. Using genome-wide CRISPR screens, we find that BET inhibitor efficacy in mediating transcriptional silencing and growth inhibition depends on the auxiliary module of the INTAC complex, a global regulator of polymerase pause-release dynamics. This process bypasses a requirement for INTAC's catalytic activities and instead leverages direct engagement of the auxiliary module with the RACK7/ZMYND8–KDM5C complex to remove histone H3K4 methylation. Targeted degradation of the COMPASS subunit WDR5 to attenuate H3K4 methylation restores sensitivity to BET inhibitors, highlighting how simultaneously targeting coordinated chromatin and transcription regulators can circumvent drug-resistant tumors.

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Catalytic-independent functions of INTAC confer sensitivity to BET inhibition

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